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CVE-2022-48890

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: scsi: storvsc: Fix swiotlb bounce buffer leak in confidential VM storvsc_queuecommand() maps the scatter/gather list using scsi…

Published Aug 21, 2024CWE-401EPSS 0.21%

Overview

CVE-2022-48890 is a medium-severity vulnerability. It was published on August 21, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

scsi: storvsc: Fix swiotlb bounce buffer leak in confidential VM

storvsc_queuecommand() maps the scatter/gather list using scsi_dma_map(),

which in a confidential VM allocates swiotlb bounce buffers. If the I/O

submission fails in storvsc_do_io(), the I/O is typically retried by higher

level code, but the bounce buffer memory is never freed. The mostly like

cause of I/O submission failure is a full VMBus channel ring buffer, which

is not uncommon under high I/O loads. Eventually enough bounce buffer

memory leaks that the confidential VM can't do any I/O. The same problem

can arise in a non-confidential VM with kernel boot parameter

swiotlb=force.

Fix this by doing scsi_dma_unmap() in the case of an I/O submission

error, which frees the bounce buffer memory.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/67ff3d0a49f3d445c3922e30a54e03c161da561eRefgit.kernel.org/stable/c/87c71e88f6a6619ffb1ff88f84dff48ef6d57adb

How CyberStrike helps

Frequently asked questions

What is CVE-2022-48890?

CVE-2022-48890 is a medium-severity vulnerability. It was published on August 21, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2022-48890?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2022-48890?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2022-48890?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2022-48890 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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